Hello everyone. I have a couple of questions and hope to get more info.

I am arriving SFO-ZRH on UA flight and have a separate ticket ZRH-IST on TK with TK's business class. Flight with TK is 9 hours later.

Assuming that I don't have checked luggage, and can get TK's BP in advance, can I go to Senator Lounge, leave my carry-on in the locker, then exit the airport, go to the city and come back?

Thanks.